Oil burner draft control



March 30, 1937. BRADEN 2,075,334

OIL BURNER DRAFT CONTROL Original Filed Feb. 11, 1952 iillllll) P m. Q.

M BFflDf/V INVENTOR.

Patented Mar. 30, 1937 [UNITED STATE a i ,4 z.

' OFFICE OIL BURNER DRAFT CONTROL Marshall H. Braden, Rock island, 11L, assignor, by mesne assignments, to Oil Burner Builders, 1110., Davenport, Iowa, a corporation of iowa 3 Claims.

The present invention relates to oil burner units and more especially to heaters of the domestic type, though the invention is not limited thereto and may be applied to larger capacity 5 heaters, will more fully appear hereinafter.

This is a division of my prior co-pending application, Serial No. 592,282, filed February 11, 1932, on Demountable oil burner mechanism.

The primary purpose of this invention is to 1 provide readily adjustable control means for the air admission opening to the burner fan; to provide means for the purpose stated which is so constructed that the amount of air admitted may be regulated with nicety from a small minimum 15 to a large maximum. This invention comprises such further objects, advantages, and capabilities as will hereafter appear and as are inherent in the construction disclosed herein. My invention further resides in the combination, construction 0 and arrangement of parts illustrated in the accompanying drawing and, while I have shown therein what is now considered the preferred embodiment of this invention, I desire the same to be understood as illustrative only and not to be interpreted in a limiting sense.

In the drawing annexed hereto and forming a part hereof,

Fig. 1 is a plan view of a burner unit embodying my present invention, with the cover of the fan removed to show the relationship of the damper mechanism to the fan;

Fig. 2 is a substantially horizontal section through the damper mechanism;

Fig. 3 is a fragmentary elevation designed to illustrate the relationship of the parts of the damper.

Reference will now be made in greater detail to the annexed drawing for a more complete description of this invention. Mounted on a 40 main base I is an auxiliary base 2 which carries a motor 3. The air'conduit 4 which surrounds the fuel nozzle and electrodes and carries the air to the point of combustion is also carried by the main base I, as is the switch box 5. As disclosed 45 in my prior application referred to above, the main and auxiliary bases are connected only by resilient cushions at the four corners of the auxiliary base. These practically eliminate transmission of vibrations from the motor to the base,

50 air tube 4, furnace, and house. On the shaft 5 of the motor 3 is mounted a fan 1 which is contained in the compartment 8 provided with a cover not shown herein but bearing the number 20 in the application identified above. In the 55 wall 9 of the compartment 8 and. opposite the open end of the fan is a sleeve It having a flange H which rests against the outside of the wall 9. Extending across this sleeve is a bar l2 having substantially midway of its length an enlargement l3 provided with a screw-threaded opening for the reception of the correspondingly threaded member M by which the damper member is carried. This damper member is indicated in general by the numeral !5.

A nut Hi on the screw-threaded member I4 10 screws against the cross bar 12 and secures these two in relatively adjusted position. The damper member !5 has screw-threaded connection with the outer end of member l4 and is held in relatively adjusted position by means of the nut ll. 15 Between the nut l1 and the end of boss l9 on the inner face of damper i5 is a screen I8 whose function is to prevent children and others from pushing anything through the openings of the damper and into the fan compartment. As shown most clearly in Figs. 2 and 3, the damper member i5 comprises outer and inner relatively adjustable members 2! and 22 which may be secured in relatively adjusted positions by means of the bolts 23. The parts 2i and 22 are pro- 25 vided with openings 24 which may be caused to register more or less closely so as to regulate the amount of air admitted to the fan chamber.

If the damper i5 is entirely closed up against the flange H and the openings 24 in members 2! and 22 are entirely open and yet the burner does not receive air enough, the nut I6 is loosened so as to permit damper IE to be moved away from flange ll somewhat so as to permit a greater supply of air to reach the fan. If it is now found that too much air is delivered to the fan,

a part of this supply can be cut oil by loosening the bolts 23 and adjusting the parts 2| and 22 somewhat with relation to each other. When the spacing of the damper 15 from the flange H has been made such that the supply of air to the burner is approximately correct, the nut it can be tightened up to hold these parts in adjusted position and the remainder of the adjustment can be made by means of the relative 5 adjustment of the parts 2| and 22. Thereafter,

if minor adjustments in the size of the burner nozzle be made, it is not likely that the spacing of the damper i5 from the flange I I will have to be changed, any necessary change in the air supply being accomplished by means of adjustment of the plates 2! and 22. However, if it should prove that this adjustment is insufficient, any needed major adjustment may be made, as indicated above, by changing the spacing of the parts H and I5. This arrangement gives a nicety of adjustment of the air supply which is impossible with prior structures and which is important with the present day refined oil burner mechanisms.

It is of course understood that the specific description of structure set forth above may be departed from Without departing from the spirit of my invention as set forth in this specification and the appended claims.

Having now described my invention, I claim:

1. In an oil burner mechanism, a fan housing having an opening opposite the end of the fan for the admission of air, damper mechanism covering said opening and being adjustable to regulate the effective carrying capacity thereof, said damper mechanism comprising a pair of relatively adjustable apertured plates, adjustment of which varies the effective size of the openings 7 through the plates, supporting means in connecr 2. In an oil burner mechanism, a fan housing having an opening opposite the, end of the fan for the admission of air, a cross bar extending across said opening, substantially diametrically, said cross bar having an opening therein ap proximately midway thereof for the reception of a support for a damper member, a support in said opening and adjustable therein, damper mechanism carried by the outer end of said support, said damper mechanism being adjustable toward and away from the wall of the fan housing to regulate the air carrying capacity of the 7 opening through the housing wall, said damper mechanism comprising a pair of superposed, apertured, relatively adjustable plates, adjustment of which with relation to each other regulates,

the effective air carrying openings through the damper.

3. A structure as defined by claim 2 having a reticulated guard secured on the inside of the damper member to prevent foreign objects from being inserted therethrough into the fan chamber.

MARSHALL H. BRADEN. 

